feat: add .editorconfig and fix indent of some files (#98)

.editorconfig

@@ -0,0 +1,76 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+# Change these settings to your own preference
+indent_style = space
+indent_size = 4
+
+# We recommend you to keep these unchanged
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{js,html}]
+indent_style = space
+indent_size = 2
+
+[*.json]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[*.sh]
+indent_style = tab
+indent_size = 4
+
+[*.{,.dist}]
+indent_style = space
+indent_size = 4
+
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = false
+
+[api/helm/api/**.yaml]
+indent_style = space
+indent_size = 2
+
+[.github/workflows/*.yml]
+indent_style = space
+indent_size = 2
+
+[.gitmodules]
+indent_style = tab
+indent_size = 4
+
+[.php_cs{,.dist}]
+indent_style = space
+indent_size = 4
+
+[.travis.yml]
+indent_style = space
+indent_size = 2
+
+[composer.json]
+indent_style = space
+indent_size = 4
+
+[docker-compose{,.*}.{yaml,yml}]
+indent_style = space
+indent_size = 2
+
+[Dockerfile]
+indent_style = tab
+indent_size = 4